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Specifications
SKU: 112687
1Wire Digital Thermometer
| Parameter | Symbol | Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|---|
| Supply Voltage | VDD | Operating | 3.0 | 5.0 | 5.5 | V |
| Storage | -0.5 | 6.0 | V | |||
| Operating Temperature | Toper | -55 | 125 | °C | ||
| Conversion Time | tconv | 9-bit resolution | 93.75 | ms | ||
| 10-bit resolution | 187.5 | ms | ||||
| 11-bit resolution | 375 | ms | ||||
| 12-bit resolution | 750 | ms | ||||
| Accuracy | -10°C to +85°C | ±0.5 | °C | |||
| -55°C to +125°C | ±2 | °C | ||||
| Resolution | Configurable | 9 | 12 | 12 | bits | |
| Output Current | IOL | VOUT = 0V, TA = 25°C | 3 | 15 | mA | |
| Input Leakage | IIH | VIN = VDD, TA = 25°C | -1 | 1 | μA | |
| IIL | VIN = 0V, TA = 25°C | -1 | 1 | μA | ||
| Quiescent Current | IQ | TA = 25°C, VDD = 5V | 10 | 50 | μA | |
| TA = 25°C, VDD = 3V | 10 | 60 | μA |
Instructions for Using DS1820
Power Supply:
- The DS1820 can operate with a supply voltage (VDD) ranging from 3.0V to 5.5V.
- Ensure the supply voltage is stable and within the specified range to avoid damage or incorrect operation.
Temperature Measurement:
- The operating temperature range is from -55°C to +125°C.
- The accuracy of the temperature measurement is ±0.5°C from -10°C to +85°C and ±2°C from -55°C to +125°C.
Resolution Configuration:
- The resolution of the temperature measurement can be configured to 9, 10, 11, or 12 bits.
- Higher resolution results in longer conversion times:
- 9-bit: 93.75 ms
- 10-bit: 187.5 ms
- 11-bit: 375 ms
- 12-bit: 750 ms
Conversion Time:
- The conversion time depends on the selected resolution. Ensure that your system allows sufficient time for the conversion to complete before reading the temperature data.
Current Specifications:
- The output current (IOL) when the output is low (VOUT = 0V) is between 3 mA and 15 mA.
- The input leakage current (IIH and IIL) should be kept within ±1 μA to ensure accurate readings.
Quiescent Current:
- The quiescent current (IQ) at 25°C is between 10 μA and 60 μA, depending on the supply voltage.
Communication:
- The DS1820 uses a 1-Wire protocol for communication.
- Ensure that the 1-Wire bus is properly configured and terminated to avoid signal integrity issues.
Initialization:
- Before performing any temperature conversions, initialize the DS1820 by sending the appropriate reset and initialization commands as specified in the 1-Wire protocol.
Reading Temperature Data:
- After the conversion is complete, read the temperature data from the DS1820 using the 1-Wire protocol.
- The temperature data is stored in a 16-bit register, with the most significant byte (MSB) representing the integer part and the least significant byte (LSB) representing the fractional part.
Error Handling:
- Monitor the status of the DS1820 to detect any errors or anomalies during operation.
- Implement error handling routines to manage and recover from any issues that may arise.
By following these instructions and parameters, you can effectively use the DS1820 for temperature sensing applications.
(For reference only)Inquiry - DS1820
